Info-Zip Unzip 6.00 was released in 2009 and has not been updated since. Most Linux distros (and Apple) just ship that 15-plus-year-old code with their own patches on top to fix bugs and improve compatibility with still-maintained but non-free (or less-free) competing implementations. Unfortunately, while the Info-Zip license is pretty liberal when it comes to redistribution and patching, it makes it hard to fork the project; furthermore, anyone who wanted to do so would face the difficult decision of either dropping or trying to continue to support dozens of legacy platforms. Therefore, nobody has stepped up to take charge and unify the many wildly disparate mini-forks.